Telephone circuit and apparatus



(No Model.)

G. W. MoDANIEL. TELEPHONE CIRCUIT AND APPARATUS.

No. 539,142. Patented May 14, 1895.

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"NITED' STATES CHARLES W. MODANIEL, OF KANSAS CITY, MISSOURI.

PATENT Cortes.

TELEPHONE CIRCUIT AND APPAR A'l'USh SPECIFICATION formingupart of Letters Patent No. 539,142, dated May 14, 1895.

Application filed March 16 1895. Serial No. 541,973- (No model.)

To all whom it. may concern.-

Be it known that I, CHARLES W. MODANIEL, residing at Kansas City, in the county of J ackson and State of Missouri, have invented certain Improvements in Telephone Circuits and Apparatus, of which the following is a specification.

One important branch of the telephone business consists in the construction and maintenance of long lines or circuits extending between towns and cities terminating at each end in a central station or exchange. When such circuits are of considerable length, they pass through intervening towns or way stations into which they are looped, or connected so that communication may be made to and from the central stations at each terminus of the circuit irom and. to any way station, and from one way station to another.

My invention relates to such circuits and to the apparatus located at the way stations connected thereto, whereby a substation at either end of the circuit may be in conversational connection with the central office nearest thereto, and whereby two way stations centrally located in the circuit may at the same time be conversing with each other.

' In carrying out the invention, I provide at each way station the usual telephone apparatus associated with a telephone substation with such additions thereto as are necessary to the working thereof.

The main circuit, consisting of two conductors loops into each way station through two looping jacks or sockets in series, and branches extend therefrom to the telephones and magneto bell box connections. A testing jack or socket with a resistance coil is bridged in between the looping jacks across the cirsecond spring is also in connection with the metal frame of the jack. I

The generator and telephone circuits are in series, the generator however being normally shunted. This circuit terminates in a double conductor cord and plug and'is independent of the ringer or bell circuit, and when the plug is inserted in either of the looping jacks the main circuit is transferred to the contacts of the plug leaving the call bell behind in the opposite direction, so that the bell can only ring from a station on the opposite side from which the circuit is being used; and a station can ring'itsvown bell only when the plug is in the test jack. 1

A way station may be signaled from either central office but to call the central stations or another way station, it is necessary to insert the plug into one of the looping jacks (which one depends upon the side of the line the station to be called is located) in order to connect in the magneto generator, to send a signaling current, and to use the telephones. When the plug is so inserted into a jack, the telephone and generator circuits are shunted, and a circuit extends through to the second jack, but when the generator crank is rotated the generator is automatically bridged in and a .currentsent to the plugged side of the circuit; and when the telephone is removed from its hook switch, the conductors to the second jack are opened thereby and the telephones are included in circuit through the plug, with the called station.

The called or respondingstation, in answering, inserts the home plug into the test jack or in either of the looping jacks to ascertain from which side of the line the call comos, and then inserts the plug in the proper jack, or the one on the side toward the calling station. Before plugging in to call a station, to prevent annoyance at any station by sending to line a current from the generator, it is desirable to insert the plug into the testing jack to ascertain the condition of the circuit. Even if the plug is carelessly left in the jack, hanging the telephone on the hook switch completes a circuit through the way station.

The call bell is placed as usual on the door Ito of the magneto generator box, and as it is desirable in testing the line to switch out the call bells, I provide means for automatically doing this.

To more specifically indicate the invention, reference is had to the drawings, in which- Figure 1 represents a circuit consisting of two conductors extending between two central stations or exchanges A and B, which may be located many miles apart, to which circuit way-stations C, D, E, and F are connected, each way-station being provided with a complete telephone outfit embodying my invention, as indicated at C. Fig. 2 is a diagram of the circuits and apparatus at each way-station. Fig. 3 is a diagram to indicate in a simple manner the changes of circuits made by the apparatus in securing a connection with another station, and Fig. at shows a means of switching the call-bell from circuit.

CL and I) represent the two conductors of a long telephone circuit extending between central stations or exchanges A,and B, and C, D, E, and F, represent way stations into which the circuit is looped or extended; the conductor a, uniting with the upper spring 3, of jack j, and continuing by its contact 6 and wire 2 to contact e of jack j and from the spring .9 to line; while the conductor 1) unites with spring g of jackj and from its contactfcontinues by wire 1 to contactf of jackj and from the spring g to line.

Bridged in between the wires 1 and 2 is an open jack 7' with a high resistance coil R in one of its branches. From the wires 1 and 2 branches and d extend respectively to the screw p0sts5 and 6 between which the ringer or call bell L is permanently bridged in. A wire 7 extends from screw post to the foot of the spring25 whose free end rests under the insulated pin 40 of the hook switch M and also has contact with the free end of a similar spring 26, from whose foot a wire 12 extends to the spring to. A wire 15 extends from screw post 6 to the foot of spring 23 in normal contact with the hook switch.

P is a double connecting plug with its tip connected to screw post 4 by wire 9, and its sleeve connected to screw post 3 by wire 8. From the screw post 4 a wire 10 connects to the rigid end of spring 2) of the generator G which is in normal contact with the ring m on the crank shaft 70, the circuit continuing by the metal part of the generator to screw 41 and wire 16 to screw post 17, from whence one wire 29 extends to the foot of spring 21 in normal contact with the hook switch, and another wire 31 goes to the telephone receiver and by wire 32 to screw post 18; a wire -12 extending therefrom to screw post 22, between which and screw post 21 the secondary helix 2' of induction coil I is connected. A wire 43 connects the screw post 21 with the hook switch; and a wire 44 connects screw post 21 with post 20, between which and the post 19 is included the primary helix 1'? of induction coil I, battery 60 and telephone transmitter H. From post 19 a wire 27 extends to spring a. Awire 11 connects the post 3 with the spring 1" of the generator and from a point on said wire there extends the continuation of wire 12 to the point 28.

It will be seen that the ringer or call bell L can-be rung from a distant station, in a manner well understood, it being always bridged in between the circuit conductors; but when a substation initiates a call, the plug P has to be inserted into jackj orj it depending upon whether the station wanted is 011 the right or left side of the calling station, in order to introduce the generator G into the circuit. The effect of this is seen clearer in Fig. 3, where the plug is inserted into the jack j The tip of the plug raises the two springs s and g from their contacts e and f the latter spring making contact with the tip and transferring the circuit of conductorb from wire 1 to wire 9 of the plug cord, the circuit from conductor a now continuing from the frame of the jack to the sleeve of the plug to wire 8. The main circuit being thus severed by the insertion of the plug into the jack j a new circuit is at the same time established through the way station, and is traced from conductor a, sleeve of plug, wires 8 and 12, springs 26 and 25, wire 7 to conductor 2, to the opposite portion of conductor a; returning by conductors b and 1, wire 15, spring 23, hook switch M, spring 24, wires 29 and 16, around the shunted genorator G, wire 9, tip of plug to conductor 12.

When the hook switch is depressed there is a bridge from points 33 and 17, in the conductors of the through circuit, by means of wire 45, hook switch M, spring 24 and wire 29, shunting another circuit to the said points, consisting of the wires and 36, including the telephones t and H.

Rotating the crank of the magneto generator causes the ring m to leave spring 71 and make contact with the spring 7', thus introducing the coils of the generator into the circuit in a well known manner, and a current is sent, see Fig. 3, from one side through the shunt 1' and m, (now closed,) wires 11 and 8, sleeve of plug, to frame of jack and conductor a; to the called station; the return being by conductor I), tip of plug, and wire 9 to the other side of the gen erator. Portions of the current will go out by wires 8 and 16 but will not be effective at any station, the main current goingas indicated.

\Vhen the telephone t is removed from its hook switch the latter rises and opens the shunts closed by the springs 23 and 24, and between springs 25 and 26, leaving the telephones in a clear circuit, from conductors a, sleeve of plug, wires 8, 35, 36, 16 and 9, and tip of plug to conductor 12.

By means of the hook switch, when the telephone is thereupon, each conductor a, b, has a circuit through the way station and magneto bell, and removing the telephone opens IIO these conductors; so that by means of the established, so that if the plug is left in its socket the main circuit can be used.

To prevent the annoyance of ringing when the telephone may be at the ear of a person at a way station, I have added the testing jack 7' provided with a high resistance coil R at one side to prevent short circuiting the main circuit, so that the plug may be inserted therein and the operator listen in to learn if any one is talking.

In testing the circuit, it is desirable that the call bells shall be switched out, and in Fig. 4, I show means for doing this.

50 represents a side of the box, and 51 a portion of its door or cover to which the call bell is attached as usual.

52 is 'a hingeconnecting the cover with the box. One leaf of the hinge is wider than its mate and to this a wire. l t from one side of the "call bell helices is connected, the wire 13 from the other side of the helices connecting directly with one of the line conductors. A spring 53 screwed to the inner surface of the box 50, carries the other part of the wire 14:, connected to the remaining circuit conductor, and is arranged to come in contact with the wide leaf of the hinge when the door is closed, and to separate thereform when the door is opened, and sever the bridge in which the bell is connected.

Having fully described my invention,'I'

claim 1. A telephone circuit entering and extend ing through a plurality of way stations, in series, in each of which the circuit passes through two double spring jacks between which branches extend from each circuit conductor to a high resistance call bell in a permanentbridge; and other branches extending from the said conductors to the open terminals of a connecting plug; whereby when the said plug is inserted into one of said jacks the circuit conductors are opened at the said jack and transferred through the said plug terminals to the other jack, a new circuit through the way stations being established, through the telephone switch.

2. A telephone circuit entering and extending through a plurality of way stations, in series, in each of which the circuit passes through two double spring jacks between which branches extend from each circuit conductor to a high resistance call bell in a permanent bridge; and other branches extending from the said conductors to the open terminals of a connecting plug;'whereby when the said plug is inserted in one. of said jacks the circuit conductors are opened at the said jack and transferred through the said plug terminals to the otherjack, a new circuit through the way station being established, and the call bell left in a shunt or parallel circuit.

3. A telephone circuit to which are con nected a plurality of way stations, in series,

in each of which the circuit passes through two spring jacks, between which branch conductors extend from each circuit conductor to the open terminals of a connecting plug, adapted to be inserted in one of said jacks and to transfer the main circuit through its own conductors; a normally shunted magneto generator in one of said branch conductors, provided with an automatic shunting device, whereby when the said plug is in sorted into one of said jacks and the crank of the generator rotated the generator is included between the branch conductors.

4. A telephone circuit to which are connected a plurality of way stations, in each of which the circuit passes through two double spring jacks, between which branch conductors extend from each circuit conductor to the open terminals of a connecting plug adapted to be inserted into one of said jacks and to transfer the main circuit through its own conductors; telephones in a normal shunt circuit between said branch conductors; a telephone support or hook switch normally operating to close each of said branch conductors and to shunt said telephones.

5. A main telephone circuit entering and extending through a plurality of way stations in series, in each of which the circuit passes through two double spring jacks, between which branch conductors extend from each of the circuit conductors to the open terminals of a connecting plug; and telephones in a circuit between said branchconductors and in shunt or parallel thereto when the receiving telephone is upon its supporting hook switch; and means for severing the said main circuit on either side of a way station and for switching the telephones into one side of said severed circuit, consisting of inserting the connecting plug into one of the spring jacks, and in removing the telephone from the hook switch 6. Amain telephone circuit entering and extending through a plurality of stations in series, in each of which the circuit passes through two double spring jacks, branch conductors from the said circuit conductors including a high resistance call bell; atest jack in a bridge between the said circuit conductors; and a testing circuit including telephones and a double connecting plug; whereby upon the insertion of the plug into the test jack the testing circuit is bridged into the main circuit.

7. A main telephone circuit extending between two central stations, and connecting into and extending through a plurality of intervening way stations in series, in each of which the circuit passes through two double spring jacks between which branch conduc- IlO tors extend from each circuit conductor to In testimony whereof I have signed my' include in a parallel circuit with the main name to this specification, in the presence of lo circuit ahigh resistance call belllocated upon two subscribing witnesses, this 11th day of the door of a magneto generator box a por- March, 1895.

5 tion of said parallel circuit being through a CHARLES W. MODANIEL.

spring and. hinge of the said door; whereby \Vituesses: upon opening the said door the parallel cir- H. W. BELLARD,

cuitis broken. S. O. PETTIT. 

